18105165 has 24 divisors (see below), whose sum is σ = 33797400. Its totient is φ = 8913024.

The previous prime is 18105161. The next prime is 18105179. The reversal of 18105165 is 56150181.

It can be written as a sum of positive squares in 4 ways, for example, as 2965284 + 15139881 = 1722^2 + 3891^2 .

It is not a de Polignac number, because 18105165 - 2² = 18105161 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18105161) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14890 + ... + 16059.

It is an arithmetic number, because the mean of its divisors is an integer number (1408225).

Almost surely, 2^18105165 is an apocalyptic number.

18105165 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18105165 is a deficient number, since it is larger than the sum of its proper divisors (15692235).

18105165 is a wasteful number, since it uses less digits than its factorization.

18105165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30973 (or 30970 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 27.

The square root of 18105165 is about 4255.0164512020. The cubic root of 18105165 is about 262.5835380379.

The spelling of 18105165 in words is "eighteen million, one hundred five thousand, one hundred sixty-five".